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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;

<span class="kw">use</span> <span class="kw">super</span>::{
    <span class="ident">FAIL_STATE</span>,
    <span class="ident">StateIdx</span>, <span class="ident">AcAutomaton</span>, <span class="ident">Transitions</span>, <span class="ident">Match</span>,
    <span class="ident">usize_bytes</span>, <span class="ident">vec_bytes</span>,
};
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">autiter</span>::<span class="ident">Automaton</span>;

<span class="doccomment">/// A complete Aho-Corasick automaton.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This uses a single transition matrix that permits each input character</span>
<span class="doccomment">/// to move to the next state with a single lookup in the matrix.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is as fast as it gets, but it is guaranteed to use a lot of memory.</span>
<span class="doccomment">/// Namely, it will use at least `4 * 256 * #states`, where the number of</span>
<span class="doccomment">/// states is capped at length of all patterns concatenated.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="ident">pats</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>,
    <span class="ident">trans</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">StateIdx</span><span class="op">&gt;</span>,  <span class="comment">// row-major, where states are rows</span>
    <span class="ident">out</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span>, <span class="comment">// indexed by StateIdx</span>
    <span class="ident">start_bytes</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Build a new expanded Aho-Corasick automaton from an existing</span>
    <span class="doccomment">/// Aho-Corasick automaton.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Transitions</span><span class="op">&gt;</span>(<span class="ident">ac</span>: <span class="ident">AcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">T</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fac</span> <span class="op">=</span> <span class="ident">FullAcAutomaton</span> {
            <span class="ident">pats</span>: <span class="macro">vec</span><span class="macro">!</span>[],
            <span class="ident">trans</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">FAIL_STATE</span>; <span class="number">256</span> <span class="op">*</span> <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">len</span>()],
            <span class="ident">out</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="macro">vec</span><span class="macro">!</span>[]; <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">len</span>()],
            <span class="ident">start_bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[],
        };
        <span class="ident">fac</span>.<span class="ident">build_matrix</span>(<span class="kw-2">&amp;</span><span class="ident">ac</span>);
        <span class="ident">fac</span>.<span class="ident">pats</span> <span class="op">=</span> <span class="ident">ac</span>.<span class="ident">pats</span>;
        <span class="ident">fac</span>.<span class="ident">start_bytes</span> <span class="op">=</span> <span class="ident">ac</span>.<span class="ident">start_bytes</span>;
        <span class="ident">fac</span>
    }

    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memory_usage</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">pats</span>.<span class="ident">iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> <span class="ident">p</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>())
            .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>)
        <span class="op">+</span> (<span class="number">4</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">len</span>())
        <span class="op">+</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">iter</span>()
              .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> (<span class="ident">usize_bytes</span>() <span class="op">*</span> <span class="ident">v</span>.<span class="ident">len</span>()))
              .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>)
        <span class="op">+</span> <span class="self">self</span>.<span class="ident">start_bytes</span>.<span class="ident">len</span>()
    }

    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">heap_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">pats</span>.<span class="ident">iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>() <span class="op">+</span> <span class="ident">p</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>())
            .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>)
        <span class="op">+</span> (<span class="number">4</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">len</span>())
        <span class="op">+</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">iter</span>()
              .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">vec_bytes</span>() <span class="op">+</span> (<span class="ident">usize_bytes</span>() <span class="op">*</span> <span class="ident">v</span>.<span class="ident">len</span>()))
              .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>)
        <span class="op">+</span> <span class="self">self</span>.<span class="ident">start_bytes</span>.<span class="ident">len</span>()
    }

    <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">i</span>: <span class="ident">u8</span>, <span class="ident">goto</span>: <span class="ident">StateIdx</span>) {
        <span class="kw">let</span> <span class="ident">ns</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_states</span>();
        <span class="self">self</span>.<span class="ident">trans</span>[<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">ns</span> <span class="op">+</span> <span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">goto</span>;
    }

    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">num_states</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">len</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">next_state</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">i</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">StateIdx</span> {
        <span class="kw">let</span> <span class="ident">at</span> <span class="op">=</span> <span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">num_states</span>() <span class="op">+</span> <span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>;
        <span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">trans</span>.<span class="ident">get_unchecked</span>(<span class="ident">at</span>) }
    }

    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">get_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>, <span class="ident">texti</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">Match</span> {
        <span class="kw">let</span> <span class="ident">pati</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">out</span>[<span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>][<span class="ident">outi</span>];
        <span class="kw">let</span> <span class="ident">patlen</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pats</span>[<span class="ident">pati</span>].<span class="ident">as_ref</span>().<span class="ident">len</span>();
        <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">patlen</span>;
        <span class="ident">Match</span> {
            <span class="ident">pati</span>: <span class="ident">pati</span>,
            <span class="ident">start</span>: <span class="ident">start</span>,
            <span class="ident">end</span>: <span class="ident">start</span> <span class="op">+</span> <span class="ident">patlen</span>,
        }
    }

    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">has_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">unsafe</span> { <span class="ident">outi</span> <span class="op">&lt;</span> <span class="self">self</span>.<span class="ident">out</span>.<span class="ident">get_unchecked</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">len</span>() }
    }

    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">start_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">start_bytes</span>
    }

    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">patterns</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">P</span>] {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">pats</span>
    }

    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">pattern</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">P</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">pats</span>[<span class="ident">i</span>]
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">build_matrix</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Transitions</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ac</span>: <span class="kw-2">&amp;</span><span class="ident">AcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">T</span><span class="op">&gt;</span>) {
        <span class="kw">for</span> (<span class="ident">si</span>, <span class="ident">s</span>) <span class="kw">in</span> <span class="ident">ac</span>.<span class="ident">states</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>().<span class="ident">skip</span>(<span class="number">1</span>) {
            <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> (<span class="number">0</span>..<span class="number">256</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">u8</span>) {
                <span class="self">self</span>.<span class="ident">set</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">StateIdx</span>, <span class="ident">b</span>, <span class="ident">ac</span>.<span class="ident">next_state</span>(<span class="ident">si</span> <span class="kw">as</span> <span class="ident">StateIdx</span>, <span class="ident">b</span>));
            }
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">pati</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">s</span>.<span class="ident">out</span> {
                <span class="self">self</span>.<span class="ident">out</span>[<span class="ident">si</span>].<span class="ident">push</span>(<span class="ident">pati</span>);
            }
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">FullAcAutomaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;FullAcAutomaton({:?})&quot;</span>, <span class="self">self</span>.<span class="ident">pats</span>)
    }
}
</pre>
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